Improvement in chucks



G. W. MOULTO N. cnucxs.

No. 171,160. Patented Dec.14,1875.

WITNESSES ATTORNEYS UNITED STATES" PATENT CFFIGE.

GEORGE W. MOULTON, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR OF ONE- HALF HIS RIGHT TO J. M. ELLIS, OF'SAME PLACE.

IMPROVEMENT IN CHUCKS.

Specification forming part of Letters Patent N0. 171,160, dated December 14, 1875; application October 30, 1875.

To all whom it may concern.

Be it known that I, GEO. W. MOULTON, of Bridgeport, in the county of Fairfield and State of Connecticut, have invented a new and valuable Improvement in Lathe or Drill Chuck 5 and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings making apart of this specification, and to the letters and fig; ures of reference marked thereon. v

Figure 1 of the drawings is a representation of the top view of the chuck. Figs. 2, 3, 5, and 6 are detail views of the same. Fig. 4 is a sectional view.

This invention has relation to improvements in chucks for drills or lathes; and it consists in the combination, with radial griping-jaws movable to or from each other, for the purpose of seizing and releasing a drill or shaft, and a slotted cam-plate actuating the said jaws, of a worm-screw projecting through the chuck-shell, and engaging with spaced pins on the inner face of the said cam-plate, whereby a convenient and reliable means is provided for operating "the jaws, as will be hereinafter more fully explained and claimed.

In the annexed drawings, the letter A designates a cylindrical metallic shell of suitable diameter, which is provided at one end with a screw-threaded rabbet, a, by means of which the said shell is secured to a chuck-box onthe worm-screw S is rotated it will communicate a rotary motion to the disk B, and this motion of the latter is utilized for operating the jaws C in the following manner, to wit: The upper face of disk B is provided with a number of grooves, g, which are eccentric and equal in number to the jaws designed to be used. These jaws are-designated by the letter C in the drawings, and are arranged each in a slot, i, radiating from a central orifice, j, in a faceplate, D, which is screwed on the shell, and they have upon their inner surfaces lugs l, which engage-in grooves g. Consequently, when the worm-screw is operated, the plateB will be rotated, and grooves 9 made to perform the functions of cams, thus simultaneousl y actuating the griping-jaws C to or from each other, according to the direction of the rotation imparted to the said screw.

In practice disk or cam-plate B will be received in a ring, R, which is held against rotation by means of set-screws d passing through the walls of the shell, and bearingagainst the periphery of the ring. When from long use cam-plate B becomes worn upon its periphery, whereby its action upon the jaws would be unreliable and unsteady, this ring may be taken out and replaced by a thicker one, thus taking up lost motion and rendering the usefulness of the said plate of almost infinite duration. In practice, also, worm-screw S will be held from escaping out of its seat by means of apin, 1), which passes through the shell and engages with a groove, q, formed near the head of the screw. By this means screw S will freely rotate, but will bereta-ined in its seat as long as pinp is engaged therewith.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The disk B, having segmental recess (1 upon its inner side, provided with spaced pins 0, and having eccentric cam-grooves 9 upon its outer face, in combination with an operating worm-screw, S, and griping-jaws C,

having lugs adapted to engage with grooves of disk B, substantially as set forth.

2. In combination with rotating cam-plate I B and shell A, the ring R and set-screws d, substantially as specified.

In testimony that I claim the 'above I have hereunto subscribed my name in the of two witnesses.

GEORGE W. MOULTON.

presence Witnesses GEORGE NAGEL, J. E. ELLIS. 

